Usda Hardiness Zone Map 2024 Usda. The usda plant hardiness zones are related to the average lowest minimum temperature at a location. The map was updated for the first time in a decade, and it shows the impact.
For decades, gardeners and growers have relied on the usda’s plant hardiness zone map to decide what perennials, shrubs and trees are best to grow in any specific region. The usda plant hardiness zones have long been a standard in communicating plant suitability across the us.